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General guidance for Prevention of Air Pollution by Nitrogen Oxides (NOx) Emissions

It applies to diesel engines over 130kW, built (or modified) after 1 January 2000. The main requirement is to record in the "Engine Parameter Record Book" (Records of Overhaul), any change or adjustment of NOx critical component or settings of the diesel engine. Such modifications may include changes to fuel injection timing, fuel injection equipment, the charge/ scavenge air systems or combustion chamber profile.

The Diesel engine component's ID number is subject to inspection by authorities to confirm compliance, including if necessary, an open-up inspection. Vessels are required to keep the Technical Files for each such engine.

Related articles

Other sources marine pollution by air:

Funnel Emissions

Sulfur Oxides (SOx)Emissions


Cargo vapours, Ozone depleting substances, Co2 Emissions

Other articles

  1. Marpol annex I - Preventing pollution by oil -Notes on Oily Water Separators

  2. Marpol Annex II -Noxious Liquid Substances in Bulk

  3. Marpol annex III -Pollution by other harmful substances & harmful packaged goods

  4. Marpol annex IV - Prohibition on Sewage Discharge

  5. Marpol annex V - Pollution by garbage

  6. Marpol annex VI - Pollution by air

  7. Prohibition on use of harmful (TBT) anti-fouling paints

  8. Pollution by ballast water

  9. Prevention of pollution while carrying out overboard maintenance

    Environment friendly purchasing

  10. Environmental awareness

  11. Burning of heavy fuel oil & diesel oil - Environmental impacts

Preventing air pollution various guideline:

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Environmental issues How to prevent marine pollution
Cargo & Ballast Handling Safety Guideline
Reefer cargo handling Troubleshoot and countermeasures
DG cargo handling Procedures & Guidelines
Safety in engine room Standard procedures
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